I love to cum on women and it's probably due to the fact that my wife will only let me cum in her pussy. While I'm a huge fan of that, I do enjoy some variety. So, when I have the chance to be with other women, I like to pull out and blow it on them as long as they are cool with it.
Never had the pleasure of cumming on a face, but have cummed on tits, ass cheeks, and stomachs. When I shot my load on this chick's ass, that was hotter than I expected. So, I'd say either ass or tits for me, but again, only if the woman is into it.